
*{
    margin: 0;
    padding: 0;
}
body{
    padding: 50px;
}
.main{
    position: relative;
    width: 800px;
    height: 270px;
}
.btn{
    width: 100px;
    height: 270px;
    position: absolute;
    top: 0;
    cursor: pointer;
    opacity: 0.8;
    z-index: 10;

}
.prv-btn{
    left: 0;
    background: url(../img/btn_l.png) no-repeat center center;
}
.next-btn{
    background: url(../img/btn_r.png) no-repeat center center;
    right: 0;
}
.main .list{
    list-style: none;
    width: 800px;
    height: 270px;
}
.main .list .item{
    position: absolute;
    left: 0;
    top: 0;
}
.main .item a ,.main .item img{
    display: block;
}